- TV Buyers Guide
TV Buyers Guide
Choosing a television
The world of televisions has changed dramatically in the past few years, with slim flat-panel TVs replacing bulky old-style models (known as CRT screen TVs), and digital signals increasingly taking over from analogue.
Alongside some exciting improvements in viewing experience has come a proliferation of technical terms. Shoppers who are looking for a new TV now have to work out whether they want a plasma or an LCD screen, whether they want high definition pictures (HD), whether their screen resolution should be 1080i or 1080p, and whether to plump for HD ready or Full HD.
These terms can be helpful, but are more likely to be confusing unless you know what they mean. In this guide we aim to help you cut a path through this jungle of terms so you can find the TV that is right for you.
Digital TV, Freeview and Freesat
Since 2012’s digital switchover. Need we say that you’ll first need to do one of the following three things below to be able to watch TV?:
1) Buy and connect a digital tuner (also known as a Set top box) to your existing television.
2) Get a television with a built-in digital tuner: either a built-in Freeview or Freeview HD. (Freeview is a free terrestrial service)
3) You could also get a television with a built-in Freesat HD instead. (Freesat a free satellite service, which means you’ll need a satellite dish as well as a set-top box).
4) Sign up to a cable or satellite service which offers paid-for subscription channels. You may need additional equipment for this, usually available directly from the supplier for a one-off payment. You can choose from a range of subscription services all of which offer many more channels than Freeview or Freesat.
LCD vs Plasma vs LED vs OLED
If you’re confused about the differences between LCD and plasma screens, we’ve got a simple rule: don’t be. At most screen sizes LCDs are all that is on offer. It’s generally only at large screen sizes (above 37”) that plasma and LCD screens are still battling it out. LED is a new technology that’s still quite expensive. Like plasma, it’s also only available at larger screen sizes.
If you are looking for a screen that costs below £500 or is smaller than 40”, then LCD is the way to go.
If you are looking for a larger or more expensive set than that, perhaps as the centrepiece of a home cinema set-up, you do need to decide which is right for you out of LCD, LED and Plasma. Here is a summary of the advantages and disadvantages of the three technologies.
LCD or liquid crystal displays are probably what you are using to read this page. LCD screens are made up of a grid of pixels, or points. They work by emitting light at each pixel, which acts like a mosaic to build up the overall image.
• generally cheaper at most screen sizes
• longer lasting
• easier to look after
• energy efficent, and therefore more eco-friendly
• slow response time – fast-moving images like sports or action scenes will be blurry
• sometimes black appears lighter on LCD screens than on plasma screens – check the contrast ratio to see which models have this problem.
Plasma screens create images by an electric current causing light to be emitted from gas trapped between two layers of glass. (Plasma will soon cease to be manufactured)
• fast response time – great for fast-moving images like sports matches
• better contrast ratio than LCD screens
• cheaper than LED
• for the screen to be energy-efficent, it has to be quite large (above 37")
• heavier than LCD and LED screens
• generally more expensive than LCD
• some older models suffer from ‘screen burn-in’: when left displaying a static image (like a logo on a 24 hour news channel) for a few hours, pixels would continue to display that image after the channel had been changed. This problem has generally been solved in newer models.
LED screens are a variation on LCD screens. The difference is in the back-lighting, which is provided by large numbers of indivdual light emitting diodes.
• fast response time – great for fast-moving images like sports matches
• deeper, darker blacks compared to LCD screens
• edge lit LED TVs are more energy efficent than LCD or Plasma
• edge lit LED TVs are very thin – thinner than LCD or Plasma
• local dimming LED TVs give fantastic contrast ratio – much better than LCD
• very expensive, and not of significantly higher quality than equivalent plasma screens
Oled or organic light-emitting diode emits light and colours with the use of electrical current and does not require extra lighting sources like LCDs and LEDs.
• Fast response time
• Low, low energy consumptions!
• Thinner TV builds
• Burn holes in your wallet – Expensive!
So 3D TV has been around for a while now… is it good? Well if you enjoy watching movies in 3D, then why not?
The only problem is, its best to enjoy 3D TV in its biggest size – the bigger the better! We would probably recommend a minimum of 32" for 3D TVs. (Remember, you’ll need 3D glasses!)
Passive 3D is one of those trips you’ve made to the cinema to watch 3D movies. You remember those sunglasses-looking specs that they used to give out – but now make you pay for? They make each of your eye see different lights, which your brain combines to see the 3D effects!
Passive glasses tend to be cheap and you usually get a bunch included with your TV, but the detail is not as good as active 3D.
Active 3D TVs have a better quality 3D image. The glasses is synced with your TV through either infra-red or a bluetooth signal. The glasses are generally more heavier and chunkier than passive glasses. It would also be quite expensive to buy additional glasses for your family or to replace them – these guys cost around £15 to £50+.
Full HD, HD ready, Ultra HD, 4K?
You might have noticed that some TVs are marked as HD Ready and some as Full HD – and occasionally some are marked as both! So, what is HD Ready and what’s the difference between Full HD and HD Ready TVs?
HD ready is a standard used in Europe to make HD technology less confusing. The minimum requirements for a TV to wear an HD ready badge are:
• Minimum horizontal resolution of 720 lines (in widescreen format)
• Ability to display 720p and 1080i formats
• An HDMI or Digital Video Interface (DVI interface)
• It must be compatible with analogue HD sources (like camcorders)
Full HD (or HD 1080p) is a more advanced HD standard, which claims to show HD sources (which are usually in 1080 resolution) to their full potential. TVs bearing this mark must have:
• Minimum 1920×1080 resolution
• Ability to display 1080p format without distortion
Put simply, Full HD gives better picture quality than HD Ready. However, how much difference you will actually see depends on the size of your screen (at 32" or below, the difference is usually undetectable), how good your eyesight is and how close to the TV you sit.
Ultra HD 4K
4K is now becoming known as Ultra HD or UHD. 4K resolution quadruples a Full HDTV (3840 × 2160) – How awesome is that?!
• More detail
• More depth
• More colour
Here’s a good example by Trusted Reviews, where they compare and show how big 4K technology is now:
HDMI Interfaces These are like a traditional scart interface but capable of carrying HD signals from or to other devices. HDMI inputs connect your digital TV receiver, Playstation 3 or HD DVD player to your TV.
Scart interface Scart sockets are places where you can connect other devices to your TV. If you already have a (non-HD) DVD player, a VCR and a Playstation you might want to make sure your new TV has enough Scart interfaces so you don’t have to keep crawling round the back of the TV.
Find reviews and prices at Reevoo Shopping:
Contrast ratio This figure is designed to tell you how much difference there is between dark and light colours on the TV. It is quoted as a ratio, between the brightest white and the darkest black. 500:1 means the brightest white is 500 times more bright than the darkest black. Plasma screens have historically boasted better contrast ratios than LCD screens.
Frequency angle is how often your TV refreshes the image, units of Hertz (Hz), which simply means number of refreshes per second. A TV with a 50 Hz refresh rate therefore refreshes the screen 50 times per second.
Reflection angle is simply a techy term for viewing angle. It’s designed to express how picture quality performs when it is looked at from an angle. This effect is only an issue for LCD TVs.
Response time is a similar measure to refresh rate. It specifies the time it takes for a pixel to change from being fully black to fully white to fully black again, in milliseconds (ms). A higher response time means a slower performing TV, which means fast moving images are more likely to become blurred.
Screen size in inches the size of the TV’s screen measured diagonally from corner to corner.
Screen format means the shape of the screen, which is expressed as a ratio between the width and the height of the screen. For example standard format screens (4:3) have the same shape as a 4×3 grid. These are increasingly being replaced by widescreen formats, which have a ratio between the width and the height of the screen of 16:9.
Vertical resolution in pixels: The number of pixels in your TV determines the maximum amount of detail it can display. Because most TVs have hundreds of thousands of pixels, it’s easier to quote the number of pixels across the vertical and horizontal edges. And because most TVs have the same screen shape, it’s simpler still to just quote one of these edges, by convention the vertical one. An HD Ready TV will have a vertical resolution of at least 768 pixels, which gives about 1 million pixels in the screen. a Full HD screen will have 1080 pixel vertical resolution and 2 million pixels in total.